Do not fail if no screenshots were saved

Author: alexslavr

.github/workflows/demos_visual_tests.yml

@@ -174,13 +174,15 @@ jobs:
     steps:
       - name: Merge screenshot artifacts
         uses: actions/upload-artifact/merge@v4
+        continue-on-error: true
         with:
           name: screenshots
           pattern: screenshots-*
           delete-merged: true
 
       - name: Merge accessibility reports
         uses: actions/upload-artifact/merge@v4
+        continue-on-error: true
         with:
           name: accessibility-reports
           pattern: accessibility-reports-*

.github/workflows/demos_visual_tests_frameworks.yml

@@ -477,6 +477,7 @@ jobs:
     steps:
       - name: Merge screenshot artifacts
         uses: actions/upload-artifact/merge@v4
+        continue-on-error: true
         with:
           name: screenshots
           pattern: screenshots-*

.github/workflows/testcafe_tests.yml

@@ -242,13 +242,15 @@ jobs:
     steps:
     - name: Merge screenshot artifacts
       uses: actions/upload-artifact/merge@v4
+      continue-on-error: true
       with:
         name: compared-screenshots
         pattern: compared-screenshots-*
         delete-merged: true
 
     - name: Merge failed test artifacts
       uses: actions/upload-artifact/merge@v4
+      continue-on-error: true
       with:
         name: failed-tests
         pattern: failed-tests-*